All In Agenda: Investigators expand search for missing plane

1. One week later, the world is still wondering how Malaysia Airlines Flight MH370 could disappear. Investigators expanded the search zone toward the Indian Ocean Friday on clues that the aircraft continued sending signals to a satellite hours after it lost contact with the ground. Meanwhile, Chinese scientists reported a “seismic event” on the ocean floor nearly 100 miles South of Vietnam, which they said could be consistent with an airplane crash. Michael Goldfarb, former Chief of Staff for the Federal Aviation Administration, joins us.

2. Tensions are mounting in Ukraine as Western talks with Russia seemed to fail Friday, with the Crimean vote for independence scheduled for Sunday. Vice News correspondent Simon Otrovsky reports from Simferopol, Crimea.

3. House Speaker John Boehner had some tough words for people he accused of committing food stamp fraud – but it’s state governors he’s pointing at. We’ve got the story tonight.

4. Plus: Tesla, Chris Christie, and the free market: We’ll talk with Hunter Walker, National Affairs Reporter for Talking Points Memo,Jim Appleton, president of the New Jersey Coalition of Automotive Retailers, andJosh Barro, an MSNBC Contributor and National Correspondent for the New York Times.